//
// Copyright (c) 2001-2003 BroadVision, Inc. All rights reserved.
//
// This software is copyrighted.  Under the copyright laws, this software
// may not be copied, in whole or in part, without prior written consent
// of BroadVision, Inc. or its assignees.  This software is provided under
// the terms of a license between BroadVision and the recipient, and its
// use is subject to the terms of that license.
//
// This software may be protected by one or more U.S. and International
// patents.  Certain applications of BroadVision One-To-One software are
// covered by U.S. patent 5,710,887.
//
// TRADEMARKS: BroadVision and BroadVision One-To-One are registered
// trademarks of BroadVision, Inc., in the United States and the European
// Community, and are trademarks of BroadVision, Inc., in other
// countries.  The BroadVision logo, is a trademark of BroadVision, Inc.,
// in the United States and other countries. Additionally, IONA and Orbix
// are trademarks of IONA Technologies, Ltd.  RSA, MD5, and RC2 are
// trademarks of RSA Data Security, Inc.
//

<!-- Version 1.1:  Sandeep V. Tamhankar (stamhankar@hotmail.com) -->

<!-- This script and many more are available free online at -->
<!-- The JavaScript Source!! http://javascript.internet.com -->

<!-- Begin
function emailCheck (emailStr) {
/* The following pattern is used to check if the entered e-mail address
   fits the user@domain format.  It also is used to separate the username
   from the domain. */
var emailPat=/^(.+)@(.+)$/
/* The following string represents the pattern for matching all special
   characters.  We don't want to allow special characters in the address. 
   These characters include ( ) < > @ , ; : \ " . [ ]    */
var specialChars="\\(\\)<>@,;:\\\\\\\"\\.\\[\\]"
/* The following string represents the range of characters allowed in a 
   username or domainname.  It really states which chars aren't allowed. */
var validChars="\[^\\s" + specialChars + "\]"
/* The following pattern represents the range of characters allowed as
   the first character in a valid username or domain.  I just made it
   the same as above, but if you want to add a different constraint,
   you would change it here. */
var firstChars=validChars
/* The following pattern applies if the "user" is a quoted string (in
   which case, there are no rules about which characters are allowed
   and which aren't; anything goes).  E.g. "jiminy cricket"@disney.com
   is a legal e-mail address. */
var quotedUser="(\"[^\"]*\")"
/* The following pattern applies for domains that are IP addresses,
   rather than symbolic names.  E.g. joe@[123.124.233.4] is a legal
   e-mail address. NOTE: The square brackets are required. */
var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/
/* The following string represents at atom (basically a series of
   non-special characters.) */
var atom="(" + firstChars + validChars + "*" + ")"
/* The following string represents one word in the typical username.
   For example, in john.doe@somewhere.com, john and doe are words.
   Basically, a word is either an atom or quoted string. */
var word="(" + atom + "|" + quotedUser + ")"
// The following pattern describes the structure of the user
var userPat=new RegExp("^" + word + "(\\." + word + ")*$")
/* The following pattern describes the structure of a normal symbolic
   domain, as opposed to ipDomainPat, shown above. */
var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$")


/* Finally, let's start trying to figure out if the supplied address is
   valid. */

/* Begin with the course pattern to simply break up user@domain into
   different pieces that are easy to analyze. */
var matchArray=emailStr.match(emailPat)
if (matchArray==null) {
  /* Too many/few @'s or something; basically, this address doesn't
     even fit the general mould of a valid e-mail address. */
	alert('Email address seems incorrect(check @ and .).');
	return false
}
var user=matchArray[1]
var domain=matchArray[2]

// See if "user" is valid 
if (user.match(userPat)==null) {
    // user is not valid
    alert('The username of the email address is invalid.');
    return false;
}
/* if the e-mail address is at an IP address (as opposed to a symbolic
   host name) make sure the IP address is valid. */
var IPArray=domain.match(ipDomainPat)
if (IPArray!=null) {
    // this is an IP address
	  for (var i=1;i<=4;i++) {
	    if (IPArray[i]>255) {
	        alert('Destination IP address of email address is invalid.');
		return false;
	    }
    }
    return true
}

// Domain is symbolic name
var domainArray=domain.match(domainPat)
if (domainArray==null) {
    alert('The domain name of the email address is invalid.');
    return false;
}
/* domain name seems valid, but now make sure that it ends in a
   three-letter word (like com, edu, gov) or a two-letter word,
   representing country (uk, nl).
   If there's a country code at the end of the address, the full domain
   must include a hostname and category (e.g. host.co.uk or host.pub.nl).
   If it ends in a .com or something, make sure there's a hostname.*/

/* Now we need to break up the domain to get a count of how many atoms
   it consists of. */
var atomPat=new RegExp(atom,"g")
var domArr=domain.match(atomPat)
var len=domArr.length
if (domArr[domArr.length-1].length<2 || 
    domArr[domArr.length-1].length>3) {
   // the address must end in a two letter or three letter word.
   alert('The email address must end in a three-letter domain, or two letter country.');
   return false;
}

/* If it ends in a country code, we want to make sure there are at
   least 2 atoms preceding it (representing host and category (i.e.
   com, gov, etc.)) */
if (domArr[domArr.length-1].length==2 && len<3) {
   var errStr = 'This email address ends in two characters, which is a country code. Country code must be preceded by a hostname and category, i.e., com, co, pub, pu, etc.';
   alert(errStr)
   return false
}

/* If it just ends in .com, .gov, etc., make sure there's a host name.
   This case can never actually happen because earlier checks take
   care of this implicitly, but we'll do it anyway. */
if (domArr[domArr.length-1].length==3 && len<2) {
   var errStr = 'This email address is missing a hostname.';
   alert(errStr)
   return false
}
// If we've gotten this far, everything's valid!
return true;
}
//  End -->
